Electric lamp stand



March 19, 1968 YOU HIROSE ELECTRIC LAMP STAND 2 Sheets-Sheet l FiledAug. 23, 1965 IN VEN TOR. )fok Hf' rafa.

March 19, 1968 lYou HIROSE 3,374,347

ELECTRIC LAMP STND Filed Aug. 23, 1965 v 2 sheets-sheer a INVENTOR. YOH-lfv United States Patent ilice 3,374,347 ELECTRIC LAMP STAND You Hirose,24-7 3-ban-cho, Chiyoda-ku, Tokyo, Japan Filed Allg. 23, 1965, Ser. No.481,480 2 Claims. (Cl. 24o- 52) ABSTRACT F THE DISCLOSURE A swivelarrangement including a rst member and a second member at least one ofwhich is rotatable with reference to the other about a predeterminedaxis. Resilient means interposed between the members and connectedtherewith, such resilient means biasing the members against one yanotherwith a force which varies in response to relative angular displacementof said members.

The present invention relates to an electric lamp stand. An object ofthe present invention is to supply an electric lamp stand consisted ofsupporting rods in 2 legs or more and swivel joints in 2 legs or morejointing said supporting rods.

Another object of the present invention is to supply an electric lampstand wherein a spiral spring being installed in the swivel jointjointing the supporting rods, the resilient force of the spring beingchanged in correspondence to the displacement of the center of gravityof the lamp stand due to the folding inclination of the supporting rodswhereby the lamp stand is always maintained in stability regardless ofthe 4degree of inclination of the supporting rods.

Still another object of the present invention is to supply an electriclamp stand wherein the spring installed in the swivel joint is notsimply to maintain the lamp stand in stability, but also, the springbeing formed into a conical shape, enables one to move the illuminatingbody of the lamp stand to any position as desired and maintain theilluminating member in its moved position securedly by having theconstructional frictional force changed in correspondence to the extentof the winding thereof.

Still another object of the present invention is to supply an electriclamp stand wherein a shade constituting the illuminating number beingmade freely detachably at its expanded en d, whereby the volume of thelamp stand is reduced for the convenience of packing and transportation.

Further still another object of the present invention is to supply anelectric lamp stand wherein a hood in semitransparent milky white'colourfor preventing the dispersion of illuminating light and softening thedirect projection of the light is pressedly .attached freely detachablyto the top end portion of the shade.

Further still another object of the present invention is to supply .anelectric lamp stand simple in constructional form and excellent inappearance.

In view'of the objects described above and other objects that will bedescribed hereinafter, an embodiment according to the presentinventionwill be described with reference to the accompanying drawings.

In the accompanying drawings,

FIG. l yis" a side vview of an embodiment of the electric lamp standaccording to the present invention, partly cut off;

FIG. 2 is an enlarged sectional view of the swivel joint of an importantportion thereof;

FIG. 3 is a perspective view of the swivel joint disassembled; K

FIG. 4A is a side view of the upper half thereof of the lamp shade, andFIG. 4B is a plan view of the lower half thereof;

3,374,347 Patented MarI 19, 1968 sectioned along the line ings, numeral1 indicates supporting rods in 2 legs or more jointed in order throughswivel joints a and they are made of a hollow shape 2, through whichelectric codes can be inserted.

The swivel joint a is consisted of a holding member 5 in a 2-leg form inside view parallelly provided with a pair of holding disks 4 4, a rotarymember 6 rotating in sliding contact with the inner side of said holdingmem ber 5, and a spiral spring 7, and said holding member 5 and saidrotary member 6 are securelyaiixed by a shaft 11 like a bolt and a nutinserted through a center hole 8 of said holding disks 4-4 Iand a shafthole 10 projectinglyV provi-ded on the disk portion9 of said rotarymember 6.

The rotary member 6 being made into an open portion 6 on its one side inthe present case, a pair of circular spring recipient plates 13, 14, onemade of iron and the other ofsteel, being tted into a step 12 formed onthe inside of the opening of said open portion 6', a spring 7 isinsertedly installed between said spring recipient plate 13 and one ofthe holding disks 4 4.

The spring 7 being made into a spiral form projecting in a conical formin side view, the outer end 7' thereof being bent in a hook form whichhook is hooked to a groove 15 bored on the holding disk 4 on one side ofthe holding member 5, and the inner end 7 thereof being hooked to ahooking hole 16 provided on the inner side of the circular plate 9 ofthe rotary member 6, whereby the spring 7 is compressed to a at form.Thus, spring 7 exerts a tangential force on holding member 5 and onrotary member 6, while at the same time bearing on the plate 13 and thedisk 4 to thereby exert a frictional force on the friction plate 19 as aresult of the prestressing achieved by compressing of spring 7 to flatstate.

Further, a step 17 being cut on both side outer periphery of the rotarymember 6 so as to have the outer end bent portion of decorative covers18-18 contacted along the holding disks 4-4 of the holding member 5 ttedthereonto, and also a circular friction plate 19 being contacted alongthe outside of the disk 9 of the rotary member 6, is slidingly contactedwith the holding disk 4 of the holding member 5 through said frictionplate 19.

When the swivel joint a is to be provided at the lowermost end of thelowest supporting rod 1, as shown in FIG. 1, the holding member isprovided on a supporting rod 20 which can be freely detachably insertedinto an opening 22 of a lamp support element, comprising the clamp21,which can secure the lamp to a body like a desk. Irf the joint is to beprovided as the junction between two of the supporting rods 1 instead,then the holding member is provided on a suporting tube 23 which can beconnected with the supporting rod 1.

A projected rod 24 at the upper portion of the rotary member 6 is forconnecting with the supporting rod 1.

The electric lamp stand shown in thedrawing is consisted of a pair ofswivel joints a, large and small, up and down, wherein a pair ofsupporting rods 1, large. and small, are connected withthe swivel jointsa, and to the uppermost supporting rod 1v a freely rotatable shade 25 ispivoted Land said shade 25 is so constructed as to be separable into anupper shade 25a and a lower shade 25b.

'Ihat is, the upper shade 25a being made toa thin cylindrical formexpanded to a trumpetshape, a turn switch 26 for connecting to anelectric circuit is provided on the top thereof, :and in the insidethereof a lamp attachment 27 being formed, the lower end thereof beingexpanded slightly outwardly whereby .a perpendicular ange 28 beingformed, an engaging groove 29 of a U shape engaging said flange 28 beingprovided on the upper portion of the lower shade b and the lower shade25b expanded to an arced shape is enabled to be connected with the uppershade, and further stopper pins 30 in a plurality being mounted ondesirable positions of the engaging groove 29 whereby is enabled to beinserted into a L-shape groove 31 provided on the perpendicular ange 28of the yupper shade 25a, whereby the upper and lower shade 25a, 25b canbe engagingly connected -by having the upper and lower shades rotated.

Also, on the engaging groove 29 a slot 32 is bored along said groovewhereby the effect of the dispersion of heat accumulated due to theradiation of an electric lamp is imparted thereto.

Furthermore, annular hood 34 projectingly provided with a supporting leg33 being attached freely and detachably to the lower end opening of thelower shade 25b, whereby the softening effect of illumination by saidhood 34 with a synthetic resin body of a white milky colour is intended.

In order to have the attachment of said hood 34 to the lower shade 25bbettered a cut-off portion 35 being provided on the opening of the shade25b, whereby it is so constructed as to have the hood 34 attached in asimple manner by having the supporting leg 33 inserted in along saidcut-01T portion 35.

In the accompanying drawing numeral 36 indicates an insertion throughhole bored on the rotary member 6 for inserting an electric cord,numeral 37 a sidewise fallen M- shape holder of a leg supporter 21, andnumeral 38 the threaded rod of the holder.

Describing the operation of the electric lamp stand according to thepresent invention based on the construction described above, when, inhaving the leg supported 21 securely set at a desired position iirst,the illuminating body is made to move to a desired position, and thesupporting rods 1 are folded freely through the swivel joints a, and forthe displacement of the center of gravity accompanying the fold of thesupporting rods the weight balance of the structure is maintained byhaving the resilient force of the spiral spring 7 changed by changingthe extent of its winding in proportion to the degree of inclination ofthe supporting rods 1, and the spring 7 changes automatically the extentof its winding in correspondence to the degree of fold of the upper andlower supporting rods 1 connected through the swivel joints a and thedegree of inclination of the supporting rods 1 to the leg supporter 21,in other words, the more remote from and 'lower than the position of theleg supporter 21 the illuminating position of the shade 25 or thesmaller the degree of fold of the upper and lower supporting rods 1, thetension of the spring 7 gets greater whereby the movement of the centerof gravity of the structure or the increase of load on the leg supporter21 due to the displacement of the shade 25 are reduced and absorbed.

The swivel joint a being inserted with a friction plate 19 and thespring 7 between the holding member 5 and the rotary member thereof sothat the originally conical spring 7 is axially compressed and therebyprestressed, energy storage of the spring resulting from increasedwinding of the same in a sense tightening it, causes concomitantstifening of the individual convolutions so that the biasing force ofthe spring in axial direction of the latter is increased thereby, as aresult thereof the frictional force on the friction plate 19 isincreased more and more whereby a proper frictional force is giventhereto at the time of its rotation, and in consequence the CFIfrictional force thereof in conjunction with the tension of the springbalances the weight of the shade 25 and enables the latter to maintainits state securely at any desired inclined position.

In addition, since the supporter 5 of the swivel joint a located at thelowest position is especially insertedly supported loosely in the hole22 of the leg supporter 21, the shade 25 can be rotated to any directionof 360 degrees.

When a lamp is to be lighted, if a turn switch 26 is operated, the lightof the lamp is projected downwardly through the opening of the lowershade 25b, and especially the hood 34, reducing the light to the outsideof the shade, is effective for softening the light and alsoconcentrating the light, and since a slot 32 is bored on the engaginggroove 29, it acts to reduce heat accumulation accompanying the lightingof a long duration in dispersing the heat.

The shade 25 being enabled to be separated into the upper and lowershade 25a, 25b and also the hood 34 being enabled to be parted from thelower shade 25b whereby the shade has a characteristic of convenience inthe packing and transportation thereof.

The electric lamp stand according to the present nvention beingconsisted of the supporting rods in 2 legs or more and the swivel jointsin 2 legs or more as described hereinabove, its form can significantlybe simplified and in addition the shade thereof being enabled to beinclined to fany desired position by the tension and frictional force ofthe spring installed in said swivel joint, the handling of the lampstand is very simple and is easy in operation.

What is described hereinabove is only an embodiment of the electric lampstand according to the present invention, and the present invention isnot restricted by the said embodiment by any means and is applicablewithin the whole scope of the present invention.

What is claimed is:

1. A swivel arrangement, particularly for lighting fixtures, comprisingthe combination of a first member including a -bifurcated element havingtwo spaced parallel portions, and a second member received between saidportions of said bifurcated element, at least one of said members beingrotatable with reference to the other member about a predetermined axis;and resilient means in form of a conically tapering helical torsionspring interposed in axially prestressed state between, and havingopposite axial ends respectively connected to said second member and oneof said portions of said first member, said torsion spring urging theother portion of said bifurcated element and said second member towardone another with increasing force in response to relative angulardisplacement of said members about said axis in one direction ofrotation, and with concomitant variation in the torsional force of saidspring.

2. An arrangement as defined in claim 1, and further comprising abutmentplates interposed between said other portion of the first member andsaid second member on the one hand, and lbetween said second member andsaid spring on the other hand.

References Cited UNITED STATES PATENTS 1,349,241 8/1920 Walsh 240-782,233,300 2/ 1941 Trythall 240--81 2,395,178 2/ 1946 Fiori 24U-,8l2,472,624 6/ 1949 Schwartz 240-81 2,666,844 1/1954 Beck 240--782,673,291 3/1954 Moss 240-78 FOREIGN PATENTS 188,476 3/ 1964 Sweden.

NORTON ANSHER, Primary Examiner.

R. M. SHEER, W. M. FRYE, Assistant Examiners

